1. Department of Molecular and Cellular Biochemistry; College of Medicine; University of Kentucky; Lexington KY 40536-0596 USA
2. Center for Pharmaceutical Research and Innovation; College of Pharmacy; University of Kentucky; Lexington KY 40536-0509 USA
3. Department of Chemistry of Bioactive Nitrogen-Containing Heterocyclic Bases; Institute of Bioorganic Chemistry and Petrochemistry; National Academy of Science of Ukraine; Kyiv 02094 Ukraine
4. Department of Chemistry; Taras Shevchenko Kyiv National University; Kyiv 01601 Ukraine
5. Central Laboratory for Quality Control of Medicines and Medical Products; Kyiv 04053 Ukraine
6. Lucille Parker Markey Cancer Center; University of Kentucky; Lexington KY 40536-0093 USA
7. Department of Urology; Roswell Park Cancer Institute; Buffalo NY 14263 USA